Biguande PHMB
PolyHexaMethylene Biguanide is a non-chlorine bactericide developed for use in private swimming pools. It is not recommended for use in pools fitted with an ozone device. Special versions exist for spa/hot tub use. Although it does have some algistatic properties it must be used in conjunction with specifide algicide to minimise the risk of the growth of the more robust strains of algae. Monthly oxidising with Hydrogen Peroxide is also required. Many pool owners welcome an alternative to the established halogen treatments, although it must be emphasised that PHMB and chlorine are not compatible and should not be mixed in pool water. In fact, it is vital that all traces of chlorine in a previously chlorine treated pool must be removed before any PHMB is added; this is carried out using Sodium Thiosulphate. PHMB is cationic and so acts as a flocculant in the pool. Backwashing of the filter more frequently is thus recommended.

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Source: Lovibond Handbook